mirror of https://github.com/bsnes-emu/bsnes.git
47 lines
961 B
C++
47 lines
961 B
C++
auto CPU::portRead(uint2 port) const -> uint8 {
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return status.port[port];
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}
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auto CPU::portWrite(uint2 port, uint8 data) -> void {
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status.port[port] = data;
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}
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auto CPU::io() -> void {
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status.clockCount = 6;
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dmaEdge();
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addClocks(6);
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aluEdge();
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}
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auto CPU::read(uint24 addr) -> uint8 {
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status.clockCount = speed(addr);
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dmaEdge();
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addClocks(status.clockCount - 4);
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r.mdr = bus.read(addr, r.mdr);
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addClocks(4);
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aluEdge();
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return r.mdr;
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}
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auto CPU::write(uint24 addr, uint8 data) -> void {
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aluEdge();
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status.clockCount = speed(addr);
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dmaEdge();
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addClocks(status.clockCount);
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bus.write(addr, r.mdr = data);
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}
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auto CPU::speed(uint24 addr) const -> uint {
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if(addr & 0x408000) {
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if(addr & 0x800000) return status.romSpeed;
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return 8;
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}
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if((addr + 0x6000) & 0x4000) return 8;
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if((addr - 0x4000) & 0x7e00) return 6;
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return 12;
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}
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auto CPU::readDisassembler(uint24 addr) -> uint8 {
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return bus.read(addr, r.mdr);
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}
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